Acta Physica Sinica, Journal Year: 2025, Volume and Issue: 74(12), P. 0 - 0

Published: Jan. 1, 2025

In the context of integrated space-air development, near-space aircraft is facing challenge autonomous navigation under conditions satellite denial. Pulsar a promising solution, and whether it can be applied depends on transmission characteristics X-rays in near-space. Firstly, this paper analyzes interaction between charged ions, free electrons other substances ionosphere, gives mass attenuation coefficients reflection, scattering absorption to with energy 1-100 keV. Then, based NRLMSIS 2.1 IRI-2020 models, stratified model for X-ray established, provides efficiency flux acquisition method 1-30 keV 60-100 km. Finally, we variations different season, latitude day-night, describes distribution efficiency. Analysis indicates that: (1) Photoelectric plays dominant role, while both coherent incoherent have relatively minor impacts reflection effect extremely weak negligible applicable pulsar navigation; (2) The exhibits significant positive correlation altitude, usually surpasses 80% when exceeds 10 keV; (3) distinct annual variation Arctic Antarctic regions subtle semi-annual equatorial region. It peaks winter hemisphere reaches minimum summer hemisphere, amplitude its fluctuations polar far exceeding that Additionally also shows periodic daily daytime decreases nighttime increases, diurnal being no more than 0.82%. results indicate during early morning at 75 Taking China Zhongshan Station as an example, reach up 93.57%, which represents 9.61% increase over 83.96%. This study crucial data supporting applications

Language: Английский